My F250 bed floor is 35" from the ground, the top of the side of the box is 55" from the ground. I tow a 27RKS which is built on the same frame rails/suspension and is 30'5" long. The SGS is 30'10" long. So, they are essentially "very close" to the same trailer. My trailer clears the bed by about 8.5". The front of the frame I beams sits about 1" higher than the back of the I beams, so I am about 1" "nose high". I have adjustments in my Curt hitch and my pin box that would accommodate about a 3" ability to lower the trailer.
Doing some "quick math", if your bed rails are 3.5" higher and you want to keep 8.5" clearance, the front of your trailer I beams would be about 4.5" higher than the rear. If you lowered your pinbox/hitch to have a 6" clearance, your I beams would be 2.5" lower, putting them about 2" higher than the back. I would suggest keeping at least 6" of space between the bed rails and the trailer overhang. I'd guess that to get your trailer "level" at the I beam front and rear, you'd have about 4" of bed clearance, assuming your truck "squats" the same as mine does with the pin weight on the hitch.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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